
(function($){
    $.fn.extend({
        Scroll:function(opt,callback){
            //鍙傛暟鍒濆鍖�
            if(!opt) var opt={};
            var _btnUp = $("#"+ opt.up);
            var _btnDown = $("#"+ opt.down);
            var timerID;
            var _this=this.eq(0).find("ul:first");
            var     lineH=_this.find("li:first").height(),
                line=opt.line?parseInt(opt.line,10):parseInt(this.height()/lineH,10),
                speed=opt.speed?parseInt(opt.speed,10):500;
            timer=opt.timer
            if(line==0) line=1;
            var upHeight=0-line*lineH;

            var scrollUp=function(){
                _btnUp.unbind("click",scrollUp);
                _this.animate({
                    marginTop:upHeight
                },speed,function(){
                    for(i=1;i<=line;i++){
                        _this.find("li:first").appendTo(_this);
                    }
                    _this.css({marginTop:0});
                    _btnUp.bind("click",scrollUp);
                });

            }
            var scrollDown=function(){
                _btnDown.unbind("click",scrollDown);
                for(i=1;i<=line;i++){
                    _this.find("li:last").show().prependTo(_this);
                }
                _this.css({marginTop:upHeight});
                _this.animate({
                    marginTop:0
                },speed,function(){
                    _btnDown.bind("click",scrollDown);
                });
            }

            var autoPlay = function(){
                if(timer)timerID = window.setInterval(scrollUp,timer);
            };
            var autoStop = function(){
                if(timer)window.clearInterval(timerID);
            };

            _this.hover(autoStop,autoPlay).mouseout();
            _btnUp.css("cursor","pointer").click( scrollUp ).hover(autoStop,autoPlay);//Shawphy:鍚戜笂鍚戜笅榧犳爣浜嬩欢缁戝畾
            _btnDown.css("cursor","pointer").click( scrollDown ).hover(autoStop,autoPlay);

        }
    })
})(jQuery);